Extension-ladder



Patentd Feb. 10,1880.

ITNESSES INVENTOR I fldR rnd,

ATTORNEY ".PETER'S: FHOTOLITHOGRAPHER, WASHINGTONv D. C.

UNITED STATES).

STEPHEN B. ADAMS, or DUNREITH, ssrdnon on TWO-THIRDS or HIS PATE T OFFICE.-

RIGHT TO HENRY Jr ADAMS AND JAMESW. ADAMS, OF NEW LAN-- OASTER, INDIAN EXTENSION-LADDER.

SPECIFICATION forming part vof Letters Patent No. 224,374, dated February 10, 1880.

Application filed November 22, 1879.

To all whomit may concern: I

Be it known that I, STEPHEN B. AoAMs, of Dunreith, in the county of Henry and State of Indiana, have invented a new and valuable Improvement in Extension-Ladders and I do hereby declare that the following is a full, clear, and exact description of the construction and operation of the same, reference being had to the annexed drawings, making a part of this specification, and to the letters and figures of reference marked thereon.

Figure l of the drawings is a representation of a front view of the ladder extended. Fig. 2 is a sectional view of the ladder, showing the sections arranged as a step-ladder. Fig. 3 is a detail.

This invention has relation to improvements in extension-ladders.

The object of the invention is to improve this class of ladders generally, and to devise will be hereinafter more fully set forth.

0 indicates the upper or extensible section of my improved ladder, composed of the rails a and rounds I). This section is of a width to fit snugly within the rails a of the lower section, A, and its side rails, a, are provided with spaced projecting spurs i, fitting into the grooves c, andserving to guide section 0 in its ascent or descent.

D indicates a pull-cord secured to the lower take the strain off of the rope D by passing a pin, p, through the perforations Z and i, and hold the upper section to its adjustment.

The ladder-section O is let down by loosening rope D fromitscleat e on the side rail, 11, ofthe lower ladder-section, and in the event of the upper section failing to descend through gravitation, a hitch having occurred, by pulling upon a down-haul cord or rope, g, secured to the lower round of ,the upper section and extending down to the ground.

This device is converted into a step-ladder by extending the upper section to its full play, and then throwing it into the position shown in Fig. 2, wherein the lowest pin '5 is stillengaged in the groove-of the lower section, and the upper end of the upper section is engaged between a transverse brace, 12, of the lower section and the roller d aforesaid, and pre ,vented from spreading by means of the hookrods N, secured to the lower section and en gaged in staples P on the extensible section.

It will be readily seen that the ladder above described is of great advantage in use for house-carpenters, paper-hangers, and mechanics generally, and will be of great service to farmers in building hay-stacks, and ,in general repairs of buildings.

I am aware that extension-ladders have heretofore been constructed wherein the lower section is grooved to receive an upper section having pins at its sides and sliding in said groove, the parts being operated by a tackle attached to one of the rounds of the lower ladder-section; and I do not claim such devices, broadly. v v

WVhatI claim as new,,and desire to secure by Letters Patent, is--,

The combination, in an extension and step ladder, of the grooved-section A, provided with brace 42 and roller 01 at its top portion,

and hook-rods N at its sides, with the section 0, providedwith spurs 43, adapted to travel in the grooves c in such manner that when the section 0 is drawn out to its full extent the In testimony that I claim the above I have two parts A O can be converted into a stephereunto subscribed my name in the presence ladder, the lower end pin, z, of the section 0 of two Witnesses. engaging said groove 0, whereby the adjacent 5 ends of the sections are interlocked by means STEPHEN B. ADAMS.

of the brace n and roller d, and prevented from spreading by the hook-rods N engaging Witnesses: staples P of the lower section, the whole con- WILLIAM N. NICHOLSON, structed and arranged to operate as shown JESSE HARROLD.

10 and described. 

